Casinas, J. A. (2021). Metro Manila's daily COVID-19 vaccination hits 231,000 jabs. Manila Bulletin.
Lua i Stíl Chicago (17ú heag.)Casinas, Jhon Aldrin. "Metro Manila's Daily COVID-19 Vaccination Hits 231,000 Jabs." Manila Bulletin 2021.
Lua MLA (9ú heag.)Casinas, Jhon Aldrin. "Metro Manila's Daily COVID-19 Vaccination Hits 231,000 Jabs." Manila Bulletin, 2021.
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